Machine for straightening gun-barrels.



0.E.JESSUP.`

vMACHINE FOR STRAIGHTENING GUN BARRELS. APPLICATION FILEn APR.23,1917.

Patented sept. 18,191?.

BY Q

` ATTORNEYS.

UNITED STATES PATENT oEEicE.I

ORSON E. JESSUP, 0F SPRINGFIELD, MASSACHUSETTS.

MACHINE FOR STRAIGHTENING GUN-BARRELS.

Specification of Letters Patent.

Patented sept. 18,1917.

Application led April 23, 1917. Serial No. 163,789.

Vobject of the invention is to provide a device that will enable the operator to accurately and quickly straighten the barrel'ofl a gun so that the bore therethrough is accurately formed. The inventiombroadly considered, comprisesV a pair of adjustable anvils or blocks for supporting the barrel duringthc straightening process and with means for adjustably raising and lowering the barrel as a whole, said blocks being designed to bring the line of sight through thebore to accurately coincide with the target or sighting mark. Means comprisingfrotatable hammers are located above the barrel which successively engage the barrelbetween its ,supports for straightening the same. Means are also providedfor` varying the direction of rotation of the rotatable hammers, and means are provided for permitting the rotatable hammers to be raised and lowered by the operator for varying the forceof the blow. i

Referring to the drawings:

Figure 1 is a plan view showing thedriving devices for operating the hammers and means for raising and lowering the same and the adjustable means vfor rendering the machine inoperative l Fig. 2 is a side elevational view of Fig. 1 showing the means for adjusting the table or platform as a whole on which the barrel to be straightened is placed, also 'the fixed internal gear which causes the rotatable hammers to operate; and i.

Fig. 3 is afront elevational view looking toward Fig. 2 from the left, indicating one of the rotatable hammers v'engaging the gun barrel, and themeans for supporting the hammer carrying frame. Y i

Referring to the drawings in detail: The base part of the machine is indicated at 1 and the platform part is indicated at 2 which is pivotally connected tov thebasel by means ofthe dependingiprojection and the'upwardly extending projection 4:, only lcated at 5.

one of which isshown, the pivot being indil Extending transversely. across the forward end of the machine is a shaft 6 to which is secured the hand wheel 7 having the spokes 8. Secured to the-ends of the shaft 6 are elliptical or oval shaped gears 9 ywhich engage gears 10 that are rotatably mounted in the depending hangers 11. By turning the hand wheel 7 the table 2 can be accurately raised and lowered as desired.

A stiff contractile coiled spring 12 has itsopposite ends attached to the base piece 1 and the platform 2, whereby the gears 9 and 10 are always held in mesh and the table 2 is drawn downward andiirmly held in the adjusted f position. vAdjustably mounted on the table 2 are the anvils or brackets 13 which support the ends of the gun barrel 14 that is to be straightened. These brackets, as clearly shown in' Fig. 3, have depending portions 15 l and nuts 16 for securing the same in place. They are also provided with set screws 17 for adjusting 'the anvils whereby the line of sight through the barrel may be accurately adjusted. This line of sight is shown: at 18 and the target point aty 19 on the wall.` The gun barrel 18 that is to be straightened is 'placed on these anvils and then the hand wheel 7 is rotated to raise or lower the platform 2 as a whole to bring the barrel 18 into a position that is approximately"correct, It

is to be understood vthatthe anvils -13 are then adjusted up or down independently of the platform to finally position thebarrel that is to be straightened. V

Referring now to the construction of the rotatable hammers which enga-ge the barrel that is to be straightened: vThe source of power is indicated bythe belt 20 which passes over a pulley 21. .This pulley is securedto'the'countershaft 22 which'is adi justably mounted in the bearings 23 and moved therein by any suitable means for varying the speed of the machine. Carried by the shaft 22 isa frictional disk 211 prefg verably having its periphery faced with leather.y This disk engages a second `disk `25 which is mounted on .a jack-shaft 26 that carries the cone pulleys 27 which Ain turn are belted to the cone pulleys 28 by the belt j' indicated at 29. Pulleys 28 are secured to 'i the shaft 3 0 at the forward end of the machine. 31 indicates an internal gear that is fixed against rotation' and through which the shaft 30 looselyv passes.v 32 and 33 are shafts that are rotatably mounted in the rotatable disks 34. On the ends of these shafts are secured the pinions 35 which mesh with the teeth of the gear 3l. rlhe shafts 32 have secured thereon the circular disk shaped hammers 36 which strike the gun barrel 18 for straightening the same. The disks 34 serve therefore, as a carrying frame which rotates as a whole and the pinions 35 are carried around by this frame on the inside of the gear 8l, whereby the hammers 36 are rapidly rotated'. For the purpose of raising and lowering` the shaft 30 and consequently the hammers 36 ay lever 37 is provided which is pivotally attached to the standard 38 and intermediate its ends itis attached to the shaft 30. The shaft 30 is mounted in the forward ends of the vside rods 39 which form part of a swinging frame. 40 are cross bars of this frame. The side bars are connected to an end bar or rod 41 that is pivotally mounted in the upright bearings 42. rihis frame is drawn downward by means of the springs .48 which are attached to the bearings in which the shaft 30 is mounted. The lower end of the springs is connected to a depending rod 44, which rod extends downward through the platform 2 and has the `adjustable nuts 45 on the lower ends of the same, whereby the tension of the springs 43 maybe adjusted. In addition, provision `is made for placing weights 46 and thumb nuts 47 on the upper ends of the rods 48. The weights are for` counterbalancing the swinging frame against the tension of the springs 43 and 50. Attached to the opposite ends of the bearings in which the shaft 30 is mounted are wires 49 having coiled springs 50 therein which springs are attached to rod 5l that extends upward to the ceiling overhead to which they are attached, whereby the whole frame comprising the side members, cross bars 40 and shaft 80 which carries the revolving hammers 86, may be readily raised and lowered by the lever, it being understood that the springs 50 are stronger than the springs 43 whereby the frame will be y velevated when the operator removes his hand from the lever 37. For the pur ose the handle 52 is provided as shown in Fig. l, which is suitably connected to the shaft 26 by means of the bar 53 that extends downward through. the openings 54 in the platform 2, the lower end of this rod being connected to the bar 52 below the platform whereby the disks 24 and 25 may be separated to shut 0E the source of power.

What I claim is:

l. In a machine of the kind described the combination with an adjustable table on which the article to be straightened is placed, of a plurality of bodily revolving hammers arranged for imparting blows thereto, means for rotating said hammers independently of their bodilv rotation, and means for manually moving the hammers toward the article for varying the force of adjusting anvils thereon for receiving the barrel to be straightened, a revolving frame, revoluble hammers carried by said frame, means for adjusting the table as a whole, and means for changing the direction of rotation of said frame and hammers, said table adjusting means including a pair of elliptical shaped gears located kbelow the table and engaging a pair of gears on said table.

4. The combination with the adjustable table of a gun-barrel straightening machine, of means for adjusting the table, revolving hammersfor imparting blows to the barrel, means for changing the direction of rotation of the blows, and a Lframe pivoted at one end in which the hammers are supported for elevating the hammers, as described.

5. A gun-barrel straightening machine, comprising in combination, an adjustable platform having supports for receiving and supporting the Ybarrel to bek straightened, means for individually adjusting each support, disk-shaped hammers for imparting blows to the barrel to-be straightened,a pair of revoluble disks, shaftsfor revolubly supporting the hammers and mounted in the revoluble disks, a lfixed internal gear, pinions on the hammer supporting shafts engaging the teeth of fixed gear, and means for revolving the pair of disks, whereby the disk-shaped hammers will be revolved, and carried into contacting relation with the gun-barrel.

6. A gun-barrely straightening machine comprising, in combination, a platform for straightened, a balanced frame for support- Cil ing the hammers, means for imparting rotary motion to the hammers, comprising a revoluble frame, revolnble shafts carried by the revoluble frame, a fixed gear with operative connecting means between said gear and the revolnble shafts, whereby when the revolnble frame is rotated the hammers will have rotary motion imparted thereto as described, and means for rotating the revoluble frame.

8. A gun-barrel straightening machine comprising in combination with the supporting platform, of means for imparting a revolving blow to the barrel, comprising a revolving frame in which the hammers are revolnbly mounted, a fixed internal gear, pinions engaging the teeth of said gear for revolving the hammers as said frame is rotated, and means for changing the direction of rotation of said frame.

9. A straightening machine comprising in combination with the supporting table, of means comprising eccentrically shaped gears for adjusting the table, means for adjustably supporting the barrel to be straightened, revolving hammers for engaging the barrel, manually operated means for varying the force of the blows imparted to the barrel, means for changing the direction of rotation of the hammers.

ORSON E. TES-SUP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

